Teaching blackboard writing projection device

Abstract

The invention discloses a blackboard-writing projector mechanism for teaching. The blackboard-writing projector mechanism comprises a blackboard-writing projection board (1), a background mechanism and a projector (2). The background mechanism is positioned in rear of the blackboard-writing projection board (1) which is made of transparent materials. The background mechanism comprises a belt (3) and two rollers (4) for driving the belt (3) to rotate. The belt (3) sleeves the two rollers (4) and is parallel to and close to the blackboard-writing projection board (1). A black area (3.1) and a white area (3.2) are arranged on the outer side of the belt (3), wherein the area of the white area (3.2) is equal to the projection area of the projector (2). During projection, the projectors projects images onto the white area of the belt (3). By the blackboard-writing projector mechanism, effective writing area can be increased, the other side of the belt can be moved to one side close to the blackboard-writing projection board, and the white area can move along with the belt to change projection positions to enable people at different angles to see projected content clearly.

Description

technical field [0001] The invention relates to the field of teaching tools, in particular to a blackboard projection device for teaching. Background technique [0002] The blackboard used for teaching blackboard writing is indispensable in the classroom. For modern teaching, multimedia projection is naturally indispensable. Many classrooms use teaching equipment combining blackboards and projection screens, which not only meet the needs of teachers for blackboard writing, but also use projection equipment for projection teaching. In the prior art, the projection equipment includes a projector and a projection screen. The projection screen and the blackboard are generally installed on the wall in front of the classroom. However, due to the limited area of ​​the wall, the projection screen and the blackboard often overlap. Therefore, there are following technical problems in the blackboard projection equipment of the prior art: [0003] 1. The overlapping part of the projec...

AI Technical Summary

Problems solved by technology

[0007] In view of this, the present invention provides a blackboard writing projection device for teaching with large effective writing area and adjustable projection position, aiming at the problems in the prior art that the blackboard overlaps with the projection screen to reduce the effective writing area.

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